Most cellphone chargers keep sucking power even after your phone is fully charged. The Dexim Visible Green Charger shuts off as soon as your device reaches 100%, and the cable lights up to let you know when the device is charging—no need to turn it on and see.

The Dexim Charger has a smart sensor that can tell how much it has charged your iOS device. When charging up to 65%, you'll see a fast current of light flowing through the wire, and once you get above 65% the current slows down. When you hit 100%, the light turns off, and so does the socket—so you don't waste any energy. You can grab one for iOS devices or for micro USB devices, and prices can range up to $29.99—though you can get it on Amazon for half the price. Hit the link to read more.